How Do I Get 3g On Flashed Phone On Cricket?

OK so i had the new Cricket Android with 3g so called Speed. And i had bought a Droid X on Ebay and i flashed it to cricket my self and activated it and everything but i only get 1x speed...? no 3g. is it the prl i have? i saw something a while ago that i think had something to do with prl's giving 3g...i cant remember well please help me THANK